Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc12d12f458108f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 05:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a73947946ee7e8f24d7d56fa14d9b6f SHA-1: b34192fd196cbb8436902e00c478448cbceded8d SHA-256: 4bc12d12f458108fbe3a31fdd38296922cb7b2188e80a0866f9d133827ececf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The file's structure suggests it's designed to appear as legitimate content while serving as a deceptive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/2gp99u7ah1dsvie57nftak608j/87113503022.pdf In PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/c3fvf5e8331bq3u2qb0icoc5gn/92478379334.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/gipedosuvomabi.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/33434704669.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/33871891478.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/zuzanimabuvonexuwelavu.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/72150000013.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/d65e1cr4ibi9qd80rieashc8in/lobolixufirutu.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/88039766097.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b2c967863---98026899066.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/sizumoxujolet.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/dunuwopaji.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/18940498684.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/lemugexujokumidefufinuger.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607669afc2e50---gabuvakekifalawowatu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d53eed7a113---bimanikijubu.pdfIn PDF document text
    • http://surtek.biz/image/files/20150115_091713.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/bejaxumukexidesunosiwobo.pdfIn PDF document text
    • http://novichiha.ru/pic/file/kelesekoj.pdfIn PDF document text
    • https://unchiulmihai.ro/files/fckeditor/file/71076676310.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zapari.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/27749499170.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/2ad7c1a65f30662e08ce598666cfe930/43133746181.pdfIn PDF document text
    • https://minhkygroup.com/luutru/files/89643886357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pros+and+cons+of+internet+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 17640 bytes
SHA-256: 5a3132a51470d6192f926f179b5f9c383c2ea81f6d1641d4f4be19b93f446112
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10568 bytes
SHA-256: f70748262196c4c23c1e90038cc28cbc15f9ce6a47840ffac55b884344972422
font_02_sfnt_off00012019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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